Activity of the super-soft X-ray source V Sge
Abstract
An analysis of the activity of the super-soft X-ray source (SSXS) V Sge is presented. The long-term (decades) increase of the mean brightness, revealed by [15], stopped and a decay became apparent. A large change of the character of the high/low state behaviour occurred in the last several years. The light curve displays a more complicated profile than in the previous segment of high/low state activity (1991-1995). Nowadays, episodes of long low states occur in a cycle of about 400 days, with superposed brief and less deep fadings. Similarities between the behaviour of V Sge and another SSXS RX J0513.9-6951 are pointed out. We argue that real mass transfer variations occur in V Sge, in variance with the model for the contracting and expanding H-burning white dwarf in J0513, proposed by [11].
- Publication:
-
Classical Nova Explosions
- Pub Date:
- November 2002
- DOI:
- 10.1063/1.1518226
- Bibcode:
- 2002AIPC..637..333S
- Keywords:
-
- 97.80.Hn;
- 97.80.Jp;
- 97.20.Rp;
- 97.80.Fk;
- Eclipsing binaries;
- X-ray binaries;
- Faint blue stars white dwarfs degenerate stars nuclei of planetary nebulae;
- Spectroscopic binaries;
- close binaries